Gary,
I have used a mono DMK for guiding for years now, and I have never had a problem guiding with it, light polluted or dark skies its a great little camera. There are definitely better ones out there, but after all we are discussing the DMK here.
Quite a few people seem to think the DMK is not good for guiding, but through my experience its about tweaking the camera settings in the software to get a nice guide star, there is nothing wrong with the DMK.
I would suggest going for the USB version, as the Firewire version requires its own power supply.
Cheers
Mark
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